But they were more than just pioneering. 但它们不仅具有开创性
where life had thrived for more than a billion years, 生命已在这里繁荣超过10亿年
more like the surface of the moon... 更像是月球表面
as their prey get ever more tired. 它们的猎物变得越来越疲惫
They first appeared more than 400 million years ago 它们最早出现在四亿多年前
but they've also allowed a more infamous group of fish to rule the waves. 但也使另一种更恶名昭彰的鱼类 统治海洋
But there is more to jaws than that. 但是颌的作用不止于此
Today, there are more than 30,000 species of fish. 今天存在超过三万种鱼
Within a few more, it had entirely gone. 又过了几千年 冰完全消失
with more diversity than ever before. 其多样化程度前所未有